The front windscreen armour is 1 1/4" thick.
This is the drivers hatch with it's protector scope.
The gun door is open here showing the thickness of the metal and that it is cut to a bevel to stop bullet splash from a direct front hit. There is a thin splash shield is also welded around the opening on the outside as it is an inward opening hatch. The outward opening hatches have the splash protection on the inside.
Not only are the hinges bolts with especially shaped bolt heads to deflect hits but are also welded into place.
The crew commanders hatch. You can see that there had been quite a few costs of paint applied over the years.